I have a friend who works at a science museum. He tried to reproduce this at their cocktail hour -- he had wines dyed black and asked visitors to rate their win

I have a friend who works at a science museum. He tried to reproduce this at their cocktail hour -- he had wines dyed black and asked visitors to rate their wine knowledge on a scale of 1-5 and then identify the wines as red or white. According to him, most visitors were able to get it right, and 100% of visitors who self-identified at 4/5 or 5/5 wine knowledge were able to do so correctly. I keep telling him he should re-do this study and publish it!